CN115298411B - Method for cleaning flexible tubing from a well intervention rig using a flexible tubing - Google Patents
Method for cleaning flexible tubing from a well intervention rig using a flexible tubing Download PDFInfo
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- CN115298411B CN115298411B CN202080091872.7A CN202080091872A CN115298411B CN 115298411 B CN115298411 B CN 115298411B CN 202080091872 A CN202080091872 A CN 202080091872A CN 115298411 B CN115298411 B CN 115298411B
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000004140 cleaning Methods 0.000 title claims abstract description 18
- 241000191291 Abies alba Species 0.000 claims abstract description 7
- 239000012530 fluid Substances 0.000 claims description 10
- 238000004873 anchoring Methods 0.000 claims description 4
- 238000005553 drilling Methods 0.000 claims description 4
- 239000013535 sea water Substances 0.000 claims description 3
- 238000007796 conventional method Methods 0.000 abstract description 4
- 238000007599 discharging Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 27
- 229930195733 hydrocarbon Natural products 0.000 description 8
- 150000002430 hydrocarbons Chemical class 0.000 description 8
- 230000007704 transition Effects 0.000 description 6
- 239000004215 Carbon black (E152) Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 150000004677 hydrates Chemical class 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000012188 paraffin wax Substances 0.000 description 2
- 238000005067 remediation Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/22—Handling reeled pipe or rod units, e.g. flexible drilling pipes
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
- E21B23/08—Introducing or running tools by fluid pressure, e.g. through-the-flow-line tool systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
- B63B21/50—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
- B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/0007—Equipment or details not covered by groups E21B15/00 - E21B40/00 for underwater installations
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/01—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells specially adapted for obtaining from underwater installations
Landscapes
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geochemistry & Mineralogy (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Combustion & Propulsion (AREA)
- Chemical & Material Sciences (AREA)
- Ocean & Marine Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Earth Drilling (AREA)
- Cleaning In General (AREA)
- Walking Sticks, Umbrellas, And Fans (AREA)
Abstract
The present invention relates to a method for cleaning subsea pipelines, wherein the method solves the most complex blockage of flexible subsea pipelines that is not effective with conventional methods. Furthermore, in the context where conventional methods are applicable, the present invention is a cheaper alternative to cleaning the pipeline. The method for cleaning a flexible pipe from a well intervention drill using a flexible pipe according to the invention comprises as one of its main steps: opening a flange connection (10) between two flanges (15) of sections (12 and 14) of a subsea pipeline (40) using a remotely operated vehicle (51), and installing a pull head (16 and 17) on each of these sections (12 and 14); and operating using the well intervention rig (120); installing a lifting unit (58) to lift a section (14) of subsea piping (40) with a drill string (50); lifting a section (14) of subsea piping (40) via one of its ends using a lifting unit (58) coupled to the slider (16); discharging the internal pressure in the pipe by connecting the pipe (67) with the slider (16); installing a surface flow tree (70) on the end of a section (14) of a subsea pipeline (40) using connection adapter members (90) and (91) to enable compatibility of the end of the surface flow tree section; assembling a coiled tubing (80) over the surface flow christmas tree (70) and the surface tubing (72); a cleaning operation of the section (14) of the subsea pipeline (40) is performed using the flexible pipe (80).
Description
Technical Field
The present invention addresses the more complex case of plugging of flexible subsea pipelines when the conventionally applied methods are not effective. Furthermore, the invention provides a low cost alternative to cleaning the flexible subsea pipeline.
Background
Production tubing plugging is common in the petroleum industry and occurs for a variety of reasons, the most common of which is the presence of hydrate and paraffin formation, scaling, and solids and debris deposition.
Depending on the nature and severity of the blockage, the blockage can be addressed by operating from the production unit itself, which means a lower cost when compared to intervention with a drilling rig.
Some examples of these operations would be, in increasing order of cost, the pig passing through the plugged pipeline, the pressurization and depressurization cycles of the pipeline, and the sinking of the flexible pipe from the production platform into the subsea pipeline.
However, it is not generally feasible to clean up subsea pipelines by means of a production platform, wherein the most typical scenario is one where production and service (ring) pipelines are plugged with hydrates.
In this scenario, the production platform cannot apply low pressure at the deepest section of the pipeline to decompose the hydrates, requiring intervention using a rig, conventionally comprising the steps of:
a) Recovering the anti-corrosion cap;
b) Preparing subsea tools—trt (tree intervention tool), BOPW (wellhead safety device) and FIBOP (quick disconnect tool);
c) Removing the tree cap (tree cap);
d) A sinking completion riser, or a Drill Pipe Riser (DPR);
e) Filling nitrogen into the well completion riser;
f) Connecting a subsea tool to a WCT (wet tree);
g) WCT test;
h) Measuring the production string with wire (straight tubing) and laying BRV (valve to prevent well junction) operations;
i) Filling nitrogen into the production pipe column;
j) Depressurizing the production string by adding a well completion riser;
k) Opening a side valve of the WCT and the plugged subsea string is in hydraulic communication with the interiors of the completion and production strings and waiting for the production and completion strings to fill with liquid resulting from hydrate decomposition;
l) repeating the steps i, j and k until the submarine pipeline is cleaned.
However, such conventional interventions may last for 15 days to over 100 days (extreme cases), and a typical average duration of 30 days may be considered. Furthermore, it must be considered that subsea tools for connection to WCTs are often not immediately available, which may delay recovery from production. Furthermore, conventional rig intervention methods may clear hydrates well, but may not be effective for other properties of the obstruction, in which case the pipeline is depressurized to clear the obstruction, which acts only mechanically on the obstruction to remove the obstruction.
Document BRPI0817188A2 discloses a hydrocarbon production system with a method for controlling hydrate formation in a subsea production system. The document also discloses a method comprising the steps of: the production line is depressurized to significantly reduce the gas concentration in the solution in the produced hydrocarbon fluid and then the production line is repressurized to push any remaining gas in the free gas phase from the production line back into the production line into solution. Further, the method includes displacing the production fluid within the production line by moving the displacement fluid from the service line into the integrated line and the production line. The displacement fluid preferably comprises a hydrocarbon-based fluid with a Low Dose of Hydrate Inhibitor (LDHI).
Document US20100018693A1 discloses an apparatus for inserting a flexible pipe into a subsea pipeline during, for example, hydrate remediation activities, comprising a curved guide for guiding the flexible pipe in a vertical direction at an inlet end, for a horizontal orientation or approximately horizontal at an outlet end, wherein an adapter allows the vertical position of the outlet end of the curved guide to be adjusted for specific situations, thereby preventing misalignment without using sharp bends in the transition element, allowing smooth movement of the flexible pipe along the transition element, reducing friction between the flexible pipe and the transition element.
Document WO2004053935A2 discloses an apparatus for an integrated unit comprising an electrothermal composite integrated unit which is installed in a subsea flow line for transporting produced hydrocarbons, wherein a heater has the function of preventing hydrate formation in the line.
Document US20080067129A1 discloses a method for treating a tubing for inhibiting hydrocarbon deposition of paraffin, the method comprising injecting a catalyst liquid and inducing an electromagnetic field in the hydrocarbon carried by the tubing.
Document EP1794408B1 discloses a method for removing hydrate plugs from a pipe, comprising the steps of: the impeller pig is inserted into the pipe to which the return line is connected, the pig is propelled forward in the pipe, propulsion fluid is pumped into the annulus between the oil pipe and the return line, while deposits are continuously or intermittently removed, and the return line is suitably passed from the front of the pig.
WO2017135941A1 discloses a hydrate plug remediation slide adapted to be assembled on a Remotely Operated Vehicle (ROV) and used to effectively remove plugs from subsea flow lines and subsea equipment. The system ensures that the pressure on the upstream side of the plug is reduced to create a pressure differential across the plug with a higher pressure present on the downstream side of the plug to force the plug through the manifold and into the separator vessel on the flow line repair slide.
However, as will be seen later, none of the mentioned documents gives a method of cleaning flexible tubing from the well intervention drill of the present invention using flexible tubing.
Drawings
The invention will be described in more detail below with reference to the attached drawings, which show examples of embodiments that do not limit the scope of the invention, wherein:
FIG. 1 illustrates an initial condition of subsea pipeline coupling between a FPSO and a well;
Fig. 2 illustrates the steps of the method of the invention, wherein an arrangement for opening a subsea connection between the legs of a subsea pipeline is illustrated;
FIG. 3 illustrates one of the steps of the method of the present invention, illustrating only one of the legs coupled to the well;
FIG. 4 illustrates one of the steps of the method of the present invention, wherein the collection of a blocked flexible pipe with a drill is illustrated;
FIG. 5 illustrates in detail the flexible pipe lifting assembly of the present invention;
FIG. 6 illustrates in detail the anchoring of a subsea pipeline to the turntable of a rig using a side door elevator;
FIG. 7 illustrates the connection of a cable to a slider;
FIG. 8 illustrates the assembly of a surface flow tree on the end of a subsea pipeline;
FIG. 9 illustrates a layout of ground assembled components of the apparatus;
Fig. 10 illustrates a flow chart of the method of the present invention showing the flow of fluid traveling pumped through a coiled tubing. Fluid is pumped into the coiled tubing using a standard pump unit, exits through the end of the coiled tubing, returns to the rig through the annular space between the coiled tubing and the production tubing, reaches the surface flow tree, and is diverted to a well testing facility where hydrocarbons are separated from the water in the water treatment plant, where clean water is discharged into the ocean and hydrocarbons are burned into the atmosphere.
Detailed Description
The invention includes a method of cleaning a flexible pipe from a well intervention drill using a coiled tubing, the method comprising the steps of:
a. Opening a flange connection (10) between two flanges (13 and 15) of two legs (12 and 14) of a subsea pipeline (40) and installing a pull head (16 and 17) in each of these legs (12 and 14), wherein the steps of opening the flange connection (10) and installing the pull head (16 and 17) are preferably performed by an ROV and comprise attaching a float (18 and 19) in each of the legs (12 and 14) such that each leg (12 and 14) has a curved section towards the ground, like a bulge (20), limiting the amount of oil that may leak. Furthermore, a cap (08) and shuttle tank (09) may also be used, which will serve to prevent oily fluid from leaking from the pipeline to the marine environment;
b. Moving the drilling machine (30) to a geographical position which gives up the end of the pipe to be recovered by the ground;
c. Assembling together a lifting assembly (58) for lifting a leg (14) of a subsea pipeline (40) with a drill string (50), wherein the lifting assembly (58) preferably comprises a drill pipe elevator (47) and an anchor strap (54) comprising a hook (56), the drill pipe elevator (47) being assembled in an inverted "position (52) (supported on a drill pipe connection) and attached to the drill string (50), the anchor strap (54) being attached to the inverted drill pipe elevator (52);
d. Sinking a drill string (50) with a lifting assembly (58) and engaging a hook (56) to a pull head (17) by means of an ROV;
e. Lifting a leg (14) of a subsea conduit (40) through an end of the leg (14) of the subsea conduit (40) using a lifting assembly (58) coupled to a pull head (16);
f. Anchoring the ends of the legs (14) of the subsea pipeline (40) to a turntable (60) of a drilling rig (120) using a side door lift (47); the anchoring is obtained by geometrical interference between the elevator collar and the end fitting of the flexible pipe; once installed, the collar is simply supported on the turntable;
g. Discharging the internal pressure of the pipe by means of a connection of a pipe (67), the pipe (67) preferably comprising JIC-8 connected to a pull head (16);
h. Disconnecting the pull head (17) and assembling a surface flow tree (70) at the end of the leg (14) of the subsea pipeline (40), and if required, assembling connection adapters (90) and (91) to match the end of the leg to the surface flow tree;
i. Assembling a coiled tubing (80) over the surface flow christmas tree (70) and the surface tubing (72);
j. Performing an operation of cleaning the leg (14) of the subsea pipeline (40) with a flexible pipe (80), wherein a liquid (e.g. diesel) is pumped through the interior of the flexible pipe, the liquid having the ability to dissolve the blockage, or it has mechanical power to remove the blockage;
k. cleaning the leg (14) of the subsea pipeline (40) with a high flow rate seawater cycle until the seawater returns with an oil content within acceptable ocean disposal environmental standards;
disassembling flexible pipe (80), surface pipeline (72) and surface flow christmas tree (70) components of the device;
m. installing a pull head (16) at the end of the leg (14) of the cleaned subsea pipeline (40), assembling a lifting assembly (58) for lifting the leg (14) of the subsea pipeline (40) with the drill string (50), and sinking the leg (14) of the subsea pipeline (40) to the seabed, wherein the leg (12) of the subsea pipeline (40) is located at the seabed;
n. removing the sliders (16 and 17) from the legs (12 and 14) of the subsea pipeline (40) and connecting the legs (12 and 14) via the flange connection (10).
At the end of the execution of the above steps a-m, repositioning the submarine pipeline, if necessary, so that the end of the clean leg is closer to the leg that was abandoned on the seabed; and
The flange connection (10) is a joint of two legs (12 and 14), wherein each leg comprises a flange (15) at its end.
As can be seen in fig. 8, which illustrates an exploded view of the surface flow tree (70), the major components of which can be observed. The lifting legs of the production pipe (14) are anchored to the turntable with their flanged ends (15) resting on a lift (47) for lifting the well casing, called a side door lift. A transition flange (90) is connected on the flange end of the production tubing (15) to make the production leg flange compatible with the surface flow christmas tree flange, and above this transition flange, another transition piece (91) of the flange connection for the base connection of the surface flow christmas tree (typically 8 1/4" support) is connected to connect next the surface flow christmas tree itself, which comprises accessories (92), (93), (94), (95), (96) that have been preassembled at the base of its manufacturer.
FIG. 9 illustrates a layout of the surface assembled components of the apparatus, wherein coiled tubing injector (101), articulating tubing (102), BOP (103), extension arm riser (104), hose (105), manifold (106), surface flow tree (70), production tubing (15), legs (14), and carousel (60) may be identified.
The present invention brings advantages over conventional methods, such as the elimination of the need to use subsea tools for dry pre-production in WCT or completion risers (or DPR), which reduces the time for resource mobilization and eliminates the time spent by the rig in the preparation and sinking steps of these tools, which lasts on average 7 to 10 days, still allowing mechanical direct action on the blockage, which can be more efficient than indirect action by pressurization and depressurization, and allows removal of more complex obstructions that cannot be removed by conventional methods.
Claims (5)
1. A method of cleaning a coiled tubing from an intervention drill in a well using a coiled tubing, the method comprising the steps of:
a. Opening a flange connection (10) between two flanges (13, 15) of two legs (12, 14) of a subsea pipeline (40) and installing a pull head (16, 17) in each of these legs (12, 14), wherein the step of opening the flange connection (10) and installing the pull head (16, 17) comprises attaching a float (18, 19) in each of the legs (12, 14) such that each leg (12, 14) has a curved section towards the ground, wherein in case of leakage a hood (08) and a shuttle tank (09) are used to collect oily fluid;
b. moving the drill (120) into position;
c. -assembling a lifting assembly (58) for lifting the leg (14) of the subsea pipeline (40) with a drill string (50);
d. sinking the drill string (50) with the lifting assembly (58) and engaging a hook (56) to the pull head (17);
e. -lifting the leg (14) of the subsea conduit (40) through an end of the leg (14) of the subsea conduit (40) using the lifting assembly (58) coupled to the slider (16);
f. -anchoring the end of the leg (14) of the subsea pipeline (40) on a turntable (60) of a drilling machine (120) using a side door elevator (47);
g. -evacuating the internal pressure of the subsea pipeline by means of a connection of pipes (67);
h. disconnecting the pull head (17) and assembling a surface flow tree (70) at the end of the leg (14) of the subsea conduit (40) and assembling a connection adapter (90, 91) to match the end of the leg to the surface flow tree;
i. -assembling the flexible pipe (80) over the surface flow tree (70) and surface tubing (72);
j. -performing a cleaning operation of the leg (14) of the subsea pipeline (40) using a flexible pipe (80);
k. -cyclically cleaning the leg (14) of the subsea pipeline (40) with high flow rate seawater;
disassembling flexible pipe (80), surface pipeline (72) and surface flow christmas tree (70) components of the device;
m. installing the pull head (16) at the end of the cleaned leg (14) of the subsea conduit (40), assembling the lifting assembly (58) for lifting the leg (14) of the subsea conduit (40) with the drill string (50), and sinking the leg (14) of the subsea conduit (40) to the seabed, wherein the leg (12) of the subsea conduit (40) is located at the seabed;
-removing the pull head (16, 17) from the leg (12, 14) of the subsea pipeline (40) and connecting the leg (12, 14) via the flange connection (10).
2. Method of cleaning flexible pipe from an intervention drill in a well using a flexible pipe according to claim 1, characterized in that the steps of opening the flange connection (10) and installing the pull heads (16, 17) are performed by an ROV.
3. The method of cleaning flexible tubing from an intervention drill in a well using a flexible tubing of claim 1, wherein the curved section is a bump (20).
4. The method of cleaning flexible tubing from an intervention drill in a well using a flexible tubing of claim 1, wherein the lifting assembly (58) comprises an inverted drill pipe elevator (52) attached to a drill string (50), and there is an anchor strap (54) comprising a hook (56) attached to the inverted drill pipe elevator (52).
5. The method of cleaning flexible tubing from an intervention drill in a well using a flexible tubing of claim 1, wherein the tubing (67) comprises a JIC-8 connection.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BR102019025811-0A BR102019025811A2 (en) | 2019-12-05 | 2019-12-05 | METHOD OF CLEARING FLEXIBLE PIPES USING FLEXITUBO FROM A WELL INTERVENTION RIG |
| BRBR1020190258110 | 2019-12-05 | ||
| PCT/BR2020/050511 WO2021108880A1 (en) | 2019-12-05 | 2020-12-02 | Method for clearing flexible lines using coiled tubing from a well intervention rig |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115298411A CN115298411A (en) | 2022-11-04 |
| CN115298411B true CN115298411B (en) | 2024-05-03 |
Family
ID=76221332
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202080091872.7A Active CN115298411B (en) | 2019-12-05 | 2020-12-02 | Method for cleaning flexible tubing from a well intervention rig using a flexible tubing |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US20230349244A1 (en) |
| EP (1) | EP4112871A4 (en) |
| CN (1) | CN115298411B (en) |
| AU (1) | AU2020396057A1 (en) |
| BR (1) | BR102019025811A2 (en) |
| CA (1) | CA3160888A1 (en) |
| WO (1) | WO2021108880A1 (en) |
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| US4730677A (en) * | 1986-12-22 | 1988-03-15 | Otis Engineering Corporation | Method and system for maintenance and servicing of subsea wells |
| CN1491313A (en) * | 2001-02-19 | 2004-04-21 | �����ɷ� | Seashore and seabed connecting apparatus for laying underwater pipelines in great depth |
| CN1516776A (en) * | 2001-06-15 | 2004-07-28 | �����ɷ� | Underwater pipeline connection jointed to riser |
| CN101802347A (en) * | 2007-09-25 | 2010-08-11 | 埃克森美孚上游研究公司 | The method of the hydrate under the management of water in the flowline |
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| CN106255801A (en) * | 2014-04-25 | 2016-12-21 | 塞佩姆股份公司 | The method installed from boats and ships or floating support device and implement rigid pipe |
| US9797223B1 (en) * | 2016-08-17 | 2017-10-24 | Onesubsea Ip Uk Limited | Systems and methods for hydrate removal |
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| AU4975799A (en) * | 1998-07-10 | 2000-02-01 | Fmc Corporation | Floating spar for supporting production risers |
| US7032658B2 (en) | 2002-01-31 | 2006-04-25 | Smart Drilling And Completion, Inc. | High power umbilicals for electric flowline immersion heating of produced hydrocarbons |
| US7650944B1 (en) * | 2003-07-11 | 2010-01-26 | Weatherford/Lamb, Inc. | Vessel for well intervention |
| NO322819B1 (en) | 2004-06-24 | 2006-12-11 | Statoil Asa | Method of removing deposits such as hydrate plugs |
| US20070044972A1 (en) * | 2005-09-01 | 2007-03-01 | Roveri Francisco E | Self-supported riser system and method of installing same |
| US20080067129A1 (en) | 2006-09-14 | 2008-03-20 | Weatherford/Lamb, Inc. | Inhibition of paraffin wall deposition in oil lines |
| US20100018693A1 (en) | 2008-07-25 | 2010-01-28 | Neil Sutherland Duncan | Pipeline entry system |
| US20120037376A1 (en) * | 2009-02-09 | 2012-02-16 | Schlumberger Technology Corporation | System and Method For Well Clean-Up |
| US10344549B2 (en) * | 2016-02-03 | 2019-07-09 | Fmc Technologies, Inc. | Systems for removing blockages in subsea flowlines and equipment |
| WO2019093899A1 (en) * | 2017-11-13 | 2019-05-16 | Itrec B.V. | Vessel and method for performing subsea wellbore related activities |
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2019
- 2019-12-05 BR BR102019025811-0A patent/BR102019025811A2/en active Search and Examination
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2020
- 2020-12-02 EP EP20896132.6A patent/EP4112871A4/en active Pending
- 2020-12-02 AU AU2020396057A patent/AU2020396057A1/en active Pending
- 2020-12-02 WO PCT/BR2020/050511 patent/WO2021108880A1/en unknown
- 2020-12-02 US US17/782,810 patent/US20230349244A1/en active Pending
- 2020-12-02 CA CA3160888A patent/CA3160888A1/en active Pending
- 2020-12-02 CN CN202080091872.7A patent/CN115298411B/en active Active
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| US4730677A (en) * | 1986-12-22 | 1988-03-15 | Otis Engineering Corporation | Method and system for maintenance and servicing of subsea wells |
| CN1491313A (en) * | 2001-02-19 | 2004-04-21 | �����ɷ� | Seashore and seabed connecting apparatus for laying underwater pipelines in great depth |
| CN1516776A (en) * | 2001-06-15 | 2004-07-28 | �����ɷ� | Underwater pipeline connection jointed to riser |
| CN101802347A (en) * | 2007-09-25 | 2010-08-11 | 埃克森美孚上游研究公司 | The method of the hydrate under the management of water in the flowline |
| CN102575501A (en) * | 2009-09-10 | 2012-07-11 | Bp北美公司 | Systems and methods for circulating out a well bore influx in a dual gradient environment |
| CN106255801A (en) * | 2014-04-25 | 2016-12-21 | 塞佩姆股份公司 | The method installed from boats and ships or floating support device and implement rigid pipe |
| US9797223B1 (en) * | 2016-08-17 | 2017-10-24 | Onesubsea Ip Uk Limited | Systems and methods for hydrate removal |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2020396057A1 (en) | 2022-07-07 |
| CA3160888A1 (en) | 2021-06-10 |
| BR102019025811A2 (en) | 2021-06-15 |
| CN115298411A (en) | 2022-11-04 |
| WO2021108880A1 (en) | 2021-06-10 |
| EP4112871A1 (en) | 2023-01-04 |
| EP4112871A4 (en) | 2024-01-03 |
| US20230349244A1 (en) | 2023-11-02 |
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